Insert 1 cell at the top of the columnSelect the whole of the column below the blankCopyMove to the cell to the right of the blank columnPasteMove to the next column to the right and type =MOD(ROW(),2)Copy this formula all the way down

Then select the 3 columns and goData/Filter/AutofilterClick the little arrow above the new column (which contains 1s and 0s)Select 1 or zero (whichever is opposite the second data row)Select all the visible data, Right click, and select delete rowConfirmRemove the autofilter